fpga: dfl: fme: use SI unit prefix macros

fpga: dfl: fme: use SI unit prefix macros

Substitute SI prefixes MILLI for temperature and MICRO for power, which
are exported via the hwmon sysfs interface in m°C and ųW, respectively.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Peter Colberg <peter.colberg@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20230705033548.10737-1-peter.colberg@intel.com
Signed-off-by: Xu Yilun <yilun.xu@intel.com>